Albert eosenbatim



(Model.)

A. ROSENBAUM.

SELF SETTING TIME PIECE.

Patented Sept. 4, 1888.

WITNESSES:

J/QM/ N. PETERS. Pholo-Lnhgmpher. Washington, (1

UNITED STATES PATENT OFFICE.

ALBERT ROSENBAUM,

OF NEV YORK, N. Y.

SELF-SETTING TIM E-PIECE.

SPECIFICATION forming part of Letters Patent No.389,ll1, dated September 4, 1888.

Application filed July 5, 1888. Serial 170.271035. ()Lnlel.)

To all whom it may concern:

Be it known that I, ALBERT ROSENBAUM,

of the city, county, and State of New York, have in ven ted certain new and useful Improvements in Self-Setting TimePieces, of which the following is a specification. The object of this invention is to provide an unproved self-setting timepiece, which is intended to set the hands automatically by the actlon of the striking mechanism once in every twelve or twenty-four hours; and theinvention consists of a self-setting time-piece in which a lever fulcrumed to the frame of the time-piece engages at one end a heart-cam on the arbor of the minute-hand, said arbor carrying a friction-tight driving-pinion, while the other end of said lever is engaged by an actuator connected to the striking mechanism, said heartcam being axially adjusted on its arbor by a set-screw and by a graduated disk or segment relatively to a fixed index or pointer on the frame of the clock.

In the accompanying drawings, Figure 1 represents a rear elevation of a clock-movement with my improved self-setting time piece. Fig. 2 is a horizontal section on the line a; as, Fig. 1. Fig. 3 is a detail rear view of the selfsetting attachment,shown as detached from theolock-movement; and Fig. at is a detail view of the graduated segment on the sleeve of the heart-cam, drawn on a larger scale.

Similar letters of reference indicate corresponding parts.

In the drawings, Areprcsents the frame of a clock-movement of any approved construc tion, and B the transmitting main wheel of the striking mechanism. To the arbor O of the minute-hand is applied a heart-cam, D,by means of the sleeve (1 and set-screw (2, (shown in Fig. 2,) said sleeve carrying, preferably, back of the heart-cam D a graduated segment, E, by means of which the heart-cam D may be readily adjusted axially 011 the arbor O to one side or the other of a fixed index or pointer, c, of the frame A, as shown in Fig. 1. A lever, F, is fulcrumed to the frame A, one end engaging the heart-cam D, while the other end is bent around the transmitting main wheel B of the striking mechanism into the path of a pin, f, on the same, which pin on the striking mechanism serves as the actuator for the fulcrumcd lever F. The pin f engages the lever Fonce in every twenty-four hours, and preferably when the striking mechanism strikes twelve oclock, as at that time the distance through which the main wheel 13 travels is greatest, so that the motion of the pin f imparts to the lever F a stroke of corresponding length. The pin f engages the lever F immediately before the clock strikes twelve, and releases the same as soon as it has strucktwelve,soas nottointerfcre with orblock the regular motion of the clock-movement. By the action of the pin f on one end of the lever F the opposite end of the same engages the heart cam D and moves the hands to twelve oclock, whether the clock is fast or slow-in other words, when the hands have been moved beyond twelve oclock they are returned to twelve,or if they have not reached the figure 12 the hands are moved forward to twelveby theleverF and the heart-cam I). The end of the lever F that engages the heart-can1 is heavier than the other end, which latter is engaged by the pinf on the transmitting main wheel B, so that immediately after the end of the lever F is disengaged by the pin the lever is dropped to a fixed st0p-pin, g, of the clockframe, as shown clearly in Figs. 1 and 3.

On the arborof the minute-hand is arranged a frictiorrtight pinion,7z, whichserves for driving said arbor, so as to permit the minute-hand and its arbor to be turned independently of the clock-train when the heart-cam is acted upon by the fulcrumcd lever and the actuator on the striking mechanism, said pinion being always in mesh with the time-train, the friction with its arbor 0 being suflicient to cause said arbor to turn with said pinion by the action of the time-train.

\Vatch-rnakcrs in adjusting the clock-movement compare the same with the normal clock, and instead of passing the movement through a tedious course of adjustment simply set off the difference in time by means of the heartcam and graduated disk or segment, setting said hear-team and segment toward one side or the other of theindex, according as the clock is faster or slower than the time given by the normal clock.

It is obvious that when the clock is running the difference in time will be mcch unically regulated by the hand-setting lever F when the clock strikes twelve, which moves the heartcam and sets thereby the hands either forward or backward, so that the normal time is thereby established once in every twenty-four hours. The hands may also be set every twelve hours by arranging on the main wheel B a second pin, f, atapoint diametrically opposite to the first pinfiasshown in Figs.2 and 3. The setting of the hands will only take place While the clock strikes twelve, the adjustment of the hands being then from the figure 12 on the dial either in forward or backward direction, according as the clock runs slower or faster than the normal clock. By this arrangement the work of regulating cloclcmovements is greatly facilitated, as the small differences of time between the normal time and the movements to be adjusted are accurately determined within twenty-four hours, and then set off on the movements by the proper adj ustment of the heart-cams and graduated disks or segments.

Having thus described my invention,I claim as new and desire to secure by Letters Patent-- 1. The combination, with a clock mechanism in which the drivingpinion of the minute-arbor is friction-tight on said arbor, of a heart-cam adjustable on said arbor, a lever fulcrumed to the clock-train and adapted to engage said heart-cam at one end, and an actuator connected to the striking mechanism and engaging the other end of said lever, substantially as set forth.

2. The combination, with a clock mechanism in which the driving-pinion of the minute-arbor is friction-tight on said arbor, of a heart-cam on said arbor, means for adjusting said heart-cam axially on the minute-arbor, a lever fulcrumed to the clock-frame and adapted to engage at one end the heart-cam, and an actuating-pin connected to the striking mechanism and engaging the other end of said lever, substantially as set forth.

3. The combination, with a clock mechanism in which the driving-pinion is frictiontight on said arbor, of a heart-cam on said arbor, a graduated segment attached to said heart-cam and adj ustablc with the same relatively to a fixed index or pointer on the frame of the clock, a lever fulcrumed to the clock-frame and adapted to engage at one end the heart-cam, and an actuator connected to said striking mechanism and engaging the other end of said lever, substantially as set forth.

In testimony that I claim the foregoing as my invention 1 havesigned my namein presence of two subscribing witnesses.

ALBERT ROSENBAUM.

\Vi tn esses:

PAUL GoEPEL, JOHN A. STRALEY. 

